EP0750541B1 - Dispositif de rasage - Google Patents

Dispositif de rasage Download PDF

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Publication number
EP0750541B1
EP0750541B1 EP95914728A EP95914728A EP0750541B1 EP 0750541 B1 EP0750541 B1 EP 0750541B1 EP 95914728 A EP95914728 A EP 95914728A EP 95914728 A EP95914728 A EP 95914728A EP 0750541 B1 EP0750541 B1 EP 0750541B1
Authority
EP
European Patent Office
Prior art keywords
water
polyethylene oxide
shaving
shaving system
oxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95914728A
Other languages
German (de)
English (en)
Other versions
EP0750541A1 (fr
Inventor
Yuling Yin
Mingchih Michael Tseng
Lee K. Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gillette Co LLC
Original Assignee
Gillette Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gillette Co LLC filed Critical Gillette Co LLC
Publication of EP0750541A1 publication Critical patent/EP0750541A1/fr
Application granted granted Critical
Publication of EP0750541B1 publication Critical patent/EP0750541B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/40—Details or accessories
    • B26B21/44—Means integral with, or attached to, the razor for storing shaving-cream, styptic, or the like
    • B26B21/443—Lubricating strips attached to the razor head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8105—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • A61K8/8117—Homopolymers or copolymers of aromatic olefines, e.g. polystyrene; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
    • A61K8/86—Polyethers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q9/00—Preparations for removing hair or for aiding hair removal
    • A61Q9/02—Shaving preparations

Definitions

  • the present invention relates to a shaving system of the wet shave type, more particularly to a shaving system with an improved shaving aid composite.
  • the shaving aid composite generally comprises a water insoluble polymer matrix, typically polystyrene, and a water soluble shaving aid, typically polyethylene oxide, which leaches out of the composite during shaving to enhance shave comfort.
  • plasticizer such as propylene glycol
  • the present invention is directed to a shaving system of the wet shave type comprising a blade member (one or more) and a structure which supports or holds the blade member and which has an external skin engaging portion in proximity to the blade member.
  • the shaving system may be a disposable shaving cartridge adapted for coupling to and uncoupling from a razor handle or it may be a shaving head which is integral with a razor handle so that the complete razor is discarded as a unit when the blade or blades become dulled.
  • the blade edge cooperates with the skin engaging portion to define shaving geometry.
  • the skin engaging portion includes an improved shaving aid composite which comprises a matrix of a water-insoluble polymer, an effective amount of a skin lubricating water-soluble polymer dispersed within the matrix, and a compatibilizer material that improves the compatibility of the water-soluble polymer with the water-insoluble polymer so as to reduce the domain size of the water-soluble polymer within the matrix.
  • the improved shaving aid composite provides a greater and more sustained release of the water-soluble polymer during use while maintaining good mechanical and structural integrity.
  • the shaving unit 10 shown in Figs. 1 and 2 includes base or platform member 12 molded of high impact polystyrene that includes integral coupling groove structure 14 for attachment to a razor handle and guard structure 16 that defines a transversely extending forward skin engaging surface 18.
  • base or platform member 12 molded of high impact polystyrene that includes integral coupling groove structure 14 for attachment to a razor handle and guard structure 16 that defines a transversely extending forward skin engaging surface 18.
  • On the upper surface of platform 12 are disposed steel leading blade 20 having a sharpened edge 22, steel following blade 24 having sharpened edge 26, and aluminum spacer member 28 that maintains blades 20 and 24 in spaced relation.
  • Cap member 30 is molded of high impact polystyrene and has body portion 32 that defines skin engaging surface 34 that extends transversely between forwardly projecting end walls 36 and has a front edge 38 that is disposed rearwardly of blade edge 26.
  • Integral rivet portions 40 extend downwardly from transversely extending body portion 32 and pass through holes in blades 20 and 24, spacer 28, and platform 12 to secure cap 30, blades 20, 24 and spacer 28 on platform 12.
  • Adhesively affixed to skin engaging surface 34 is shaving aid composite 42.
  • the shaving unit 50 shown in Fig. 3 is of the type shown in Jacobson, U.S. 4,586,255, and includes body 52 with front portion 54 and rear portion 56. Resiliently secured in body 52 are guard member 58, leading blade unit 60 and trailing blade unit 62. A shaving aid composite in the form of elongated insert member 64 is frictionally locked in opening 66 of rear portion 56.
  • the shaving aid composite comprises a matrix of a water-insoluble polymer, an effective amount of a skin lubricating water-soluble polymer dispersed within the matrix, and a compatibilizer material that improves the compatibility of the water-soluble polymer with the water-insoluble polymer so as to reduce the domain size of the water-soluble polymer within the matrix and enhance release of the water-soluble polymer during use.
  • the shaving aid composite may also optionally include low molecular weight water-soluble release enhancing agents such as polyethylene glycol, water-swellable release enhancing agents such as cross-linked polyacrylics, colorants, antioxidants, preservatives, microbiocidal agents, beard softeners, astringents, depilatories, medicinal agents, conditioning agents, cooling agents, etc.
  • Suitable water-insoluble polymers which can be used for the matrix include polyethylene, polypropylene, polystyrene, butadiene-styrene copolymer (e.g. medium and high impact polystyrene), polyacetal, acrylonitrite butadiene styrene copolymer, ethylene vinyl acetate copolymer and blends such as polypropylene/polystyrene blend.
  • the water-insoluble polymer comprises about 10 to 50%, more preferably about 15 to 40%, and most preferably about 20 to 30% by weight of the shaving aid composite.
  • the more preferred water-insoluble polymer is polystyrene, preferably a general purpose polystyrene such as Dow STYRON (Dow Chemical Company) or a high impact polystyrene, such as Mobil 4324 (Mobil Corporation).
  • the composite should contain a sufficient quantity of water-insoluble polymer to provide adequate mechanical strength, both during production and use.
  • Suitable skin lubricating water-soluble polymers include polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazoline, and polyhydroxyethylmethacrylate.
  • the water-soluble polymer comprises about 20 to 90%, more preferably about 40 to 80%, and most preferably about 60 to 80% by weight of the shaving aid composite.
  • the more preferred water-soluble polymers are the polyethylene oxides generally known as POLYOX (available from Union Carbide Corporation) or ALKOX (available from Meisei Chemical Works, Kyoto, Japan). These polyethylene oxides will preferably have molecular weights of about 100,000 to 6 million, most preferably about 300,000 to 5 million.
  • the most preferred polyethylene oxide comprises a blend of about 40 to 80% of polyethylene oxide having a molecular weight of about 5 million (e.g. POLYOX COAGULANT) and about 60 to 20% of polyethylene oxide having an average molecular weight of about 300,000 (e.g. POLYOX WSR-N-750).
  • the compatibilizer material may be any agent which has an affinity for both the water-insoluble polymer and the water-soluble polymer such that it improves the dispersibility of one polymer within the other and reduces the domain size of the water-soluble polymer within the matrix. It also changes the phase behavior and mechanical properties of the final polymer blend, making it softer while retaining structural integrity. Without being bound by any theory, it is believed that the compatibilizer material acts in polymer blends much in the same way as a surfactant does in oil and water systems.
  • the domain size of the polyethylene oxide phase is typically in the range of about 30-100 ⁇ m when a cross-section of the composite is viewed by SEM.
  • Shaving aid composites containing a compatibilizer material in accordance with the present invention generally have a water-soluble polymer domain size at least 50%, preferably at least 80%, smaller than that of similar composites without compatibilizer. Typically such composites will have a water-soluble polymer domain size under 10 ⁇ m, preferably about 1 ⁇ m or less.
  • the new shaving aid composites have quite different mechanical properties (generally softer) compared to conventional composites and more readily release the water-soluble polymer from the matrix during shaving.
  • the mechanical properties of the shaving aid composite can be adjusted by varying the levels of compatibilizer such that the entire composite (that is, both matrix and lubricant) gradually wears away during use, thus continuously exposing the user to a fresh composite surface providing excellent lubrication for numerous shaves.
  • the compatibilizer material will comprise about 0.5 to 15%, preferably about 1 to 10% and more preferably about 2 to 7% by weight of the shaving aid composite.
  • Suitable compatibilizer materials for use in accordance with the present invention include the following:
  • the shaving aid composite may be formed by extrusion, injection molding or in situ molding on a razor cap. Extrusion is the preferred method and should normally be performed in a controlled environment to minimize moisture absorption during fabrication.
  • the invention may be further illustrated by the following example in which all parts and percentages are by weight.
  • Shaving aid composites similar to insert member 64 shown in Fig. 3 were fabricated from the blends indicated below by extruding the blends through a Haake System 90 3/4 inch diameter extruder with a barrel pressure of about 1000-1800 psi and a temperature of about 180-185°C. and a die temperature of about 190°C. The extruded strip of composite is cooled and sliced to appropriate lengths for securing. into openings 66 of shaving units 50.
  • the polystyrene is Dow STYRON and the polyethylene oxide is a blend of 60% POLYOX COAGULANT (M.W. 5 million) and 40% POLYOX WSR-N-750 (M.W. 300,000).

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Birds (AREA)
  • Dermatology (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cosmetics (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Paper (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (17)

  1. Système de rasage du type rasage humide comprenant un élément de lame (20, 24) et une structure (30) définissant une partie externe s'engageant sur la peau (34) à proximité dudit élément de lame (20 , 24), ladite partie s'engageant sur la peau (34) comprenant un composite d'aide au rasage (42) comprenant une matrice d'un polymère insoluble dans l'eau, une quantité efficace d'un polymère soluble dans l'eau lubrifiant la peau dispersé dans ladite matrice, caractérisé en ce qu'il comprend en outre un matériau de compatibilité qui améliore la compatibilité du polymère soluble dans l'eau avec le polymère insoluble dans l'eau afin de réduire la taille du domaine du polymère soluble dans l'eau à l'intérieur de la matrice.
  2. Système de rasage selon la revendication 1, dans lequel ledit polymère soluble dans l'eau comprend d'environ 40 % à environ 80 % en poids dudit composite d'aide au rasage et est choisi parmi le poly(éthylène oxyde), la poly(vinylpyrrolidone), le polyacrylamide, l'hydroxypropylcellulose, la poly(vinylimidazoline) et le poly(méthacrylate d'hydroxyéthyle).
  3. Système de rasage selon la revendication 2, dans lequel ledit polymère insoluble dans l'eau comprend d'environ 15 % à environ 40 % en poids dudit composite d'aide au rasage et est choisi parmi le polyéthylène, le polypropylène, le polystyrène, un copolymère de polystyrène-butadiène, le polyacétal, un copolymère d'acrylonitrile-butadiène-styrène et un copolymère d'éthylène-acétate de vinyle.
  4. Système de rasage selon la revendication 3, dans lequel ledit polymère insoluble dans l'eau comprend du polystyrène et ledit polymère soluble dans l'eau comprend du poly(éthylène oxyde).
  5. Système de rasage selon la revendication 4, dans lequel ledit matériau de compatibilité comprend un copolymère de poly(éthylène oxyde)-poly(propylène oxyde).
  6. Système de rasage selon la revendication 5, dans lequel ledit copolymère de poly(éthylène oxyde)-poly(propylène oxyde) a un poids moléculaire d'environ 1 000 à environ 20 000 et un rapport oxyde d'éthylène : oxyde de propylène d'environ 10:90 à environ 80:20.
  7. Système de rasage selon la revendication 6, dans lequel ledit polymère soluble dans l'eau comprend un mélange de poly(éthylène oxyde) ayant un poids moléculaire moyen d'environ 5 millions et un poly(éthylène oxyde) ayant un poids moléculaire moyen d'environ 300 000.
  8. Système de rasage selon la revendication 7, dans lequel ledit matériau de compatibilité comprend d'environ 0,5 % à environ 15 % en poids dudit composite d'aide au rasage.
  9. Système de rasage selon la revendication 3, dans lequel ledit matériau de compatibilité comprend d'environ 0,5 % à environ 15 % en poids dudit composite d'aide au rasage et est choisi parmi des copolymères de poly(éthylène oxyde)-poly(propylène oxyde), des copolymères de poly(éthylène oxyde)-poly(propylène oxyde) d'éthylènediamine, des copolymères de polystyrène-poly(éthylène oxyde), des alkylpolyglycoléthers, des alcanolamides gras, des alkylpolyéthylèneimines, des tensioactifs anioniques et des tensioactifs cationiques.
  10. Système de rasage selon la revendication 9, dans lequel ledit polymère insoluble dans l'eau comprend du polystyrène et ledit polymère soluble dans l'eau comprend du poly(éthylène oxyde).
  11. Système de rasage selon la revendication 1, dans lequel ledit composite d'aide au rasage comprend d'environ 20 % à environ 30 % en poids de polystyrène, d'environ 60 % à environ 80 % en poids de poly(éthylène oxyde) et d'environ 1 % à environ 10 % en poids de matériau de compatibilité.
  12. Système de rasage selon la revendication 11, dans lequel ledit matériau de compatibilité est choisi parmi des copolymères de poly(éthylène oxyde)-poly(propylène oxyde), des copolymères de poly(éthylène oxyde)-poly(propylène oxyde) d'éthylènediamine, des copolymères de polystyrène-poly(éthylène oxyde), des alkylpolyglycoléthers, des alcanolamides gras, des alkylpolyéthylèneimines, des tensioactifs anioniques et des tensioactifs cationiques.
  13. Système de rasage selon la revendication 12, dans lequel la taille du domaine du poly(éthylène oxyde) à l'intérieur de la matrice est inférieure à 10 µm.
  14. Système de rasage selon la revendication 11, dans lequel ledit matériau de compatibilité comprend un copolymère de poly(éthylène oxyde)-poly(propylène oxyde) ayant un poids moléculaire d'environ 2 000 à environ 10 000 et un rapport oxyde d'éthylène:oxyde de propylène d'environ 10:90 à environ 50:50.
  15. Système de rasage selon la revendication 11, dans lequel ledit matériau de compatibilité est Poloxamer 182.
  16. Système de rasage selon la revendication 11, dans lequel ledit matériau de compatibilité est l'acide dodécylbenzènesulfonique.
  17. Système de rasage selon la revendication 11, dans lequel ledit matériau de compatibilité est Poloxamer 217.
EP95914728A 1994-03-17 1995-03-16 Dispositif de rasage Expired - Lifetime EP0750541B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US210182 1994-03-17
US08/210,182 US5454164A (en) 1994-03-17 1994-03-17 Wet shaving system with a lubricating device
PCT/US1995/003268 WO1995024996A1 (fr) 1994-03-17 1995-03-16 Dispositif de rasage

Publications (2)

Publication Number Publication Date
EP0750541A1 EP0750541A1 (fr) 1997-01-02
EP0750541B1 true EP0750541B1 (fr) 1998-01-14

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EP95914728A Expired - Lifetime EP0750541B1 (fr) 1994-03-17 1995-03-16 Dispositif de rasage

Country Status (15)

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US (1) US5454164A (fr)
EP (1) EP0750541B1 (fr)
JP (1) JPH09510375A (fr)
CN (1) CN1146172A (fr)
AT (1) ATE162130T1 (fr)
AU (1) AU680758B2 (fr)
BR (1) BR9507129A (fr)
CA (1) CA2185682C (fr)
DE (1) DE69501463T2 (fr)
ES (1) ES2111400T3 (fr)
MA (1) MA23482A1 (fr)
TR (1) TR28769A (fr)
TW (1) TW280785B (fr)
WO (1) WO1995024996A1 (fr)
ZA (1) ZA952092B (fr)

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EP3535028A1 (fr) 2016-11-03 2019-09-11 The Gillette Company LLC Élément de contact avec la peau comprenant de l'éthylène-acétate de vinyle
BR112019009754B1 (pt) 2016-11-17 2022-11-22 The Gillette Company Llc Membro de contato com a pele compreendendo etileno-acetato de vinila e uma fragrância
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CN111801206B (zh) 2018-03-30 2022-07-01 吉列有限责任公司 具有枢转部分的剃刀柄部
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Also Published As

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US5454164A (en) 1995-10-03
JPH09510375A (ja) 1997-10-21
ES2111400T3 (es) 1998-03-01
TR28769A (tr) 1997-03-12
MA23482A1 (fr) 1995-10-01
DE69501463T2 (de) 1998-07-30
AU2185595A (en) 1995-10-03
BR9507129A (pt) 1997-09-30
EP0750541A1 (fr) 1997-01-02
ZA952092B (en) 1995-12-11
TW280785B (fr) 1996-07-11
AU680758B2 (en) 1997-08-07
DE69501463D1 (de) 1998-02-19
WO1995024996A1 (fr) 1995-09-21
MX9604126A (es) 1998-06-30
CN1146172A (zh) 1997-03-26
CA2185682C (fr) 1999-08-10
CA2185682A1 (fr) 1995-09-21
ATE162130T1 (de) 1998-01-15

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